Hi Alexandre,
Sorry for the late reply. The FDS reader in ParaView is still pretty new and does not support .q and .xyz files yet unfortunately.
For now, it supports:
- Grid (domain)
- Devices & HRR
- Slices
- Boudaries
As you said, it expects a .smv as input and will use it to read .sf, .bf or .csv files in the same folder.
It appears that .xyz (and probably .q) are extensions also used by other formats supported by ParaView, explaining why you should be able to select a reader to open them (but it will not work in your case).